I need to install fresh copy of OS on my MacBook.
I guess I have to de authorize Audirvana first and after the fresh OS install download it etc.
My question is: will I loose all the playlist or these are somehow remembered under my licence?
Thanks
Fenry
You will lose them, if you don’t backup your library file of Audirvana and even your prefs if you want to have the same setup
Just in case you ask, or for others since i’m going to sleep 
Apple hide the Home Folder in User Library at some time depending on OS System… When you have clicked your Home Folder, and cannot see the Library Folder in there, just do a ‘‘cmd J’’ to show the folder settings preferences and see at the bottom… click Show Library Folder and then you’ll have access to it forever.
Close Audirvana.
Go to User… Home Folder… Library… Applications Support… Audirvana Folder…
Copy All the files in that folder (that is your database of music)
(AudirvanaPlusDatabaseV2.sqlite is for v3.5 and over,
the none V2 version is for before version of Audirvana
and you don’t need it there if you don’t use it).
Go to User… Home Folder… Library… Preferences… copy those 2 files…
com.audirvana.Audirvana-Plus.plist and com.audirvana.Audirvana.plist
in that folder (those are A+ software preferences).
Put them somewhere not on your system or Mac lol
since your gonna erase it after.
Your playlists are saved in your Database of music. Save that file and your prefs once a week or more if you do many editing to your library and copy it somewhere, then when you have a bug or duplicates or whatever, you’ll be able to come back to your latest backup 
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Thank you. Appreciated